At this time, the conflicts between the clans of daimyo that controlled small regions of land had established guerrilla warfare and assassination as a valuable alternative to frontal assault.

• 忍者通常都穿深蓝或深紫色的衣服。因为接近夜空颜色的深蓝色和深紫色着装能让忍者比较不容易被别人发现。